Refrigerating apparatus



Nov. 17, 1959 J. WEIBEL, JR 2,91 I REFRIGERATING APPARATUS Filed Dec. 5, 1955 2 Sheet-Sheet 1 INVEN TOR.

Jo/m Weibe/ Jr.

Nov. 17, 1959 J. WEIBEL, JR

REFRIGERATING APPARATUS Filed 1m. s, 1955 2 Shee5-$heet 2 IN VEN TOR.

Jdafm Weibe/ Jr.

United States Patent REFRIGERATING APPARATUS John Weibel, J12, Dayton, Ohio, assignor to General Motors Corporation, Detroit, Mich., a corporation of Delaware Application December 5, 1955, Serial No. 551,008 1 Claim. (Cl. 230-58) This invention relates to refrigerating apparatus and more particularly to a sealed motor-compressor unit for use in various types of systems.

It is an object of this invention to provide an improved means for reducing the torque reaction during starting and stopping of the motor and the associated compressor.

Another object of this invention is to provide a torque reaction snubbing means which transmits a minimum amount of noise and vibration from the motor-compressor unit to the casing which encloses the motor-compressor unit.

A further object of this invention is to provide a torque reaction snubbing means which is simple and inexpensive and which will not interfere with the installation and removal of the motor-compressor unit from the casing.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings, wherein a preferred form of the present invention is clearly shown.

In the drawings:

Fig. 1 is an elevational view, with parts broken away, showing the arrangement for supporting the motor-compressor unit within an outer casing; and

Figure 2 is a plan view, with parts broken away, showing the relationship between the motor-compressor support, the outer casing, and the torque reaction snubber springs.

Referring now to the drawing, wherein an illustrative embodiment of the invention has been shown, reference numeral designates a sheet steel outer casing which serves to enclose a motor-compressor assembly generally designated by the reference numeral 12. The motorcompressor assembly includes the usual motor 14 having a drive shaft 16 provided with an eccentric portion 18 which operates suitable connecting rods 20 which, in turn, actuate pistons such as the piston 22 for compressing refrigerant, in accordance with well-known practice.

For a more detailed description of the construction and operation of the motor-compressor unit shown herein, reference is hereby made to copending application, Ser. No. 517,603, filed June 23, 1955, now Patent No. 2,855,139.

The outer casing 10 is provided with suitable motor supporting ledges 24 on which the lower ends of conventional unit mounting springs 26 rest. The upper ends of the springs 26 serve to engage the underside of lugs 28 formed on the motor-compressor assembly 12 so as to support the weight of the motor-compressor assembly 12 in accordance with well-known practice. The springs 26 prevent the direct transmission of motor and compressor noise and vibration from the assembly 12 to the casing 10.

In a motor-compressor unit of this general type the torque reaction during the starting and stopping of the 2,913,166 Patented Nov. 17, 1959 "ice motor and the associated compressor tends to cause excessive vibration and jarring of the outer casing 10. This vibration and jarring is especially objectionable in air conditioning units such as window mounted room coolers, since the jarring forces are transmitted to the entire window unit as well as to the wall on which the Window unit is mounted. It has been found that this torque reaction can be reduced very materially by the introduction of torque reaction snubber springs such as the springs 30 which have their mid-portion secured to the motor-compressor assembly 12 by means of mounting lugs 32 and which have their ends 34 arranged to frictionally engage the inner side wall of the sealed casing 10. It should be noted that the main motor drive shaft 16 is not centrally located with respect to the cylindrical casing 10, with the result that the center of rotation of the moving parts is offset relative to the central axis of the casing 10. This arrangement, coupled with the construction and arrangement of the snubber springs serves to effectively reduce the torque reaction transmitted to the outer casing.

The snubber springs 30 are held in place by means of the cap screws 36 which pass through the mounting lugs 28 and which extend downwardly into the coil spring 26.

Each spring 30 is in the form of a relatively long and narrow blade which is provided with a relatively large end portion which forms a friction shoe which is free to adjust itself so as to frictionally engage the outer shell 10 throughout a substantial area. It has been found that torque reaction snubber springs of the type shown herein are able to cut down the torque reaction from 32 ft. lbs. to about 13 ft. lbs. without materially increasing the transmission of motor-compressor vibration and noise from the motor-compressor assembly 12 to the outer casing 10.

While the form of embodiment of the invention as herein disclosed constitutes a preferred form, it is to be understood that other forms might be adopted, as may come within the scope of the claim which follows.

What is claimed is as follows:

In a sealed motor-compressor unit, a casing, a motor having a drive shaft, a compressor directly connected to said drive shaft, a frame for supporting said motor and compressor, a plurality of resilient means suspending said frame within said casing, each of the resilient means including a coiled compression spring disposed in a vertical plane and supporting the weight of said frame, said motor and said compressor, torque reaction snubbing means comprising a plurality of blade springs secured at their mid point to said frame and having their ends arranged in sliding frictional engagement with said casing, and screw means carried by said frame for securing said blade springs in position on said frame, said screw means having their ends projecting into said coiled compression springs.

FOREIGN PATENTS Italy July 23, 1953 

